Piston



Jan. 23, 1934 A L NELsGN 1 94 4 361 PISTON Original Filed March 16, 1927 INVENTOR.

- ATTORNEYS.

Patented Jan. 23, 1 934 PISTON Adolph L. Nelson, Detroit, Mich, assignor to Bolm Aluminum & Brass Corporation, Detroit,

Mich.

Original application March 16, 1927, Serial No.

175,645. Divided and this application February 3, 1931, Serial No. 513,086, and in Canada May 12, 1927. Renewed June 3, 1932 Y r 6Claims.

This invention relates to pistons, particularly to pistons for use in internal combustion engines, and aims to improve the construction and operative results of such pistons.

The invention relates particularlyto a piston of the type disclosed in my Patent No. 1,681,621 issued August 21, 1928, but difiers from the piston disclosed in said patent in certain respects.

This application is a division of my patent No. 1,792,504,. and applications for patents for the same subject-matter have been filed in foreign countries as follows:--

Austria, Patent No. 120,703, filed July 20, 1927. Belgium, Patent No. 343,726, filed July 27, 1927. Canada, Serial No. 325,278, filed May 12, 1927. France, Patent No. 639,863, filed Aug. 20, 1927. Germany, Serial No. 27,556, filed July 14, 1927. Germany, Geb. No. 1,090,015, filed July 15, 1927. Great Britain, Patent No. 287,123, filed July 21,

Great Britain, Patent No. 287,154, filed January 16, 1928.

Italy, Patent No. 260,538,-fl1ed July 25, 1927. Switzerland, Patent No. 138,972, filed July 20.

A particular feature of the invention resides in the provision of a complete circular ring at the bottom of the piston, which is interrupted by a slot extendingupwardly under each piston pin boss'and extending through a part of the lower wall of the pin boss.

Additional objects and advantages of thein-' vention will become apparent in the following description.

While a preferred form of the invention has been setdorth herein for purposes of illustration, it should be understood that various changes and modifications may be made without departing from the spirit and scope of the invention as set forth and claimed. 1

in the drawing:

Figure 1 is a vertical section taken through a piston embodying the present invention;

Figure 2 is a vertical section taken at right angles to the section of Figure 1;

Figure 3 is a plan view loohng toward the,

by a slot 15. A pair oi struts 16 extend chordally of the piston and connect the upper ends of the thrust faces.

In the preferred form, the piston head, piers and thrust faces are formed of a continuous homogeneous piece of light-weight metal, such as aluminum alloy, and the struts 16 are made of a material, such as steel, having a'lower coemcient of thermal expansion than thematerial of the head.

The connection between the lower end of each pier and the circular part 12 is iormed by hori-" zontally extending flanges or ribs 17 that are shaped in general like a segment of a circle.-

The lower circular part 12 is reinforced'at points below the ribs 17 and in alignment with the free lateral edges of the thrust faces 13 by reinforcing pads 18 that are formed by thickening the skirt at these points.,

In order to give the lower part of the skirt a certain amount of yielding resilience, a slot 19 is formed upwardly from the bottom of the skirt below each pin boss 20. This slot extends through the lower wall of the pin boss at the outer end of the pin boss, but the inner end of so. the boss is unslotted and forms a solid cylinder.

In the preferred form a column 21 extends downwardly from the inner end of each pin boss. A vertical hole 22 runs through the column, and the slot 19 cuts through the bottom wall of the pin boss from the hole 22 to the outer end of the boss.

With this construction the lower circular part 12 is very rigidly braced against distortion and each semi-circular part. between the slots 19 will very strongly tend to maintain its true semi-circular shape. At the same time the slots 19 permit the two semi-circular halves to yield in wardly toward each other when such action becomes necessary in the operation or the piston.

I claim:

l. A piston comprising a head, a skirt portion, a piston pin bearing, and a slot formed upward- 1y from the bottom edge of the skirt portion and extending through the outer part 01 the lower 100 wall of the piston pin bearing, the inner part of said wall being reinforced.

2. A piston comprising a head, a skirt portion,

a piston pin bearing, and a slot formed upwardly from the bottom edge of the skirt portion and extending through the outer part of the lower wall of the piston pin bearing, there being a re-.

iniorcement connecting the part lyim on one side of the slot with the piston pin bearing.

2 a piston pin boss, a reinforcing part extending downward from the inner end '01" the pin boss,

the piston being formed with a slot extending upwarclly from the bottom of the skirt and extending through the lower wall of the pin boss at the outer end thereof, the inner reinforced end of the pin boss being unslotted.

4. A piston comprising a head, a skirt portion,

attached to the webs, two bearing portions extending upwardly from the circular portion, the bearing portions being spaced from the piers and the head, the inner end of each pin boss having its lower wall reinforced, the piston being formed with a slot extending upwardly from the lower edge of the skirt below each pin boss, each slot extending through one of said arcuate webs and through the lower wall of a pin boss at the outer end thereof.

6. A piston comprising a head, a skirt comprising a lower circular portion, piers depending from the head and connected to the lower circular portion, piston pin bosses in the piers and formed with axial bores, the piston being formed with at least one slot extending upwardly from the lower end of the skirt, cutting into a pier, and intersecting the bore of a pin boss.

' ADOLPH L. NELSON. 

